导读:1建站知识本篇文章是对Oracle查询和删除JOB的SQL的实现方法进行了详细的分析介绍，需要的朋友参考下营销型网站建设seo网站优化培训。

查询及删除重复记录的SQL语句1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断select * from peoplewhere peopleId in (select   peopleId from   people group by   peopleId having count(peopleId) > 1)2、删除表中多余的重复记录，营销型网站建设重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录delete from people where peopleId in (select   peopleId from people group by   peopleId   having count(peopleId) > 1)and rowid not in (select min(rowid) from   people group by peopleId having count(peopleId )>1)注:rowid为oracle自带不用该.....3、查找表中多余的重复记录（多个字段） select * from vitae awhere (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录delete from vitae awhere (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having coun网站建设哪家好t(*) > 1)网站推广优化seoand rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录select * from vitae awhere (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)(二)比方说在A表中存在一个字段“name”，而且不同记录之间的“name”值有可能会相同，现在就是需要查询出在该表中的各记录之间，“name”值存在重复的项；Select Name,Count(*) from A Group By Name Having Count(*) > 1如果还查性别也相同大则如下:Select Name,sex,Count(*) from A Group By Name,sex Having Count(*) > 1(三)方法一declare @max integer,@id integerdeclare cur_rows cursor local for select 主字段,count(*) from 表名 group by 主字段 having count(*) >； 1open cur_rowsfetch cur_rows into @id,@maxwhile @@fetch ......相关营销型网站建设seo网站优化培训。

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